Holidaying in the UK with one child and luggage (some of which went on the back seat) was manageable. But now we've got a second child I'm looking at getting some roof bars and a roof box for my Sportback. Any recommendations? Halfords own make as opposed to Thule or other branded names? Size of roof box - don't want something too big otherwise the wife will think of an excuse to fill it! (Smallest seem to be 250 litres) Has anyone any pictures with box fitted to their car?